2020 Porsche 911 Turbo S S-A — MOT failures & pass rate

Across 661 MOT tests analysed for the 2020 Porsche 911 Turbo S S-A, the most common recorded failure areas were tyres, other defects and emissions & environmental. Its pass rate of 96.2% was above the average for cars of a similar age (90.5%).

Pass rate

661

MOT tests analysed

3.8%

Fail rate

better than

vs cars of similar age

Avg age at test (yrs)

How it compares

Fail rate for this model-year against the segment and national averages for cars of a similar age.

Top failure categories

Most common MOT failure areas — 2020 Porsche 911 Turbo S S-A
#	Category	% of tests affected	Tests
1	Tyres	1.7%	11
2	Other defects	1.5%	10
3	Emissions & environmental	0.9%	6
4	Brakes	0.3%	2
5	Seat belts & restraints	0.1%	1
6	Suspension	0.1%	1

Percentage of tests with at least one failure recorded in each category.

Most common specific failures

The exact components most often recorded as failures — more specific than the categories above.

Most frequently recorded failure items — 2020 Porsche 911 Turbo S S-A
#	Failure item	Times recorded
1	Registration plates	15
2	Catalyst emissions	8
3	Tread depth	7
4	Headlamp aim	4
5	Brake discs	2
6	Catalytic converter	2

Top advisory categories

Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.

Most common MOT advisories — 2020 Porsche 911 Turbo S S-A
#	Category	% of tests with advisory	Tests
1	Tyres	8.3%	55
2	Other defects	2.0%	13
3	Visibility	1.8%	12
4	Brakes	0.3%	2
5	Body, structure & corrosion	0.1%	1
6	Lighting & signalling	0.1%	1

Failure rate by mileage

Higher-mileage cars tend to fail more — often the most useful guide to real condition.

MOT fail rate by recorded mileage band.

Fail rate by recorded mileage — 2020 911 Turbo S S-A
Mileage band	Tests	Fail rate
0-30k	634	3.9%

Failure rate by age

How this model-year's MOT fail rate climbs as the cars get older.

Trend over time

Fail rate by dataset year — 2020 911 Turbo S S-A
Dataset year	Tests	Fail rate
2023	211	2.8%
2024	220	5.9%
2025	226	2.6%

What to check before buying a 2020 911 Turbo S S-A

Before buying a 2020 Porsche 911 Turbo S S-A, focus on the areas it most often fails on. Tyres accounted for 1.7% of tests for this year.

Tyres (1.7% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
Other defects (1.5% of tests): Miscellaneous items not in the main categories. Typical repair: varies.
Emissions & environmental (0.9% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.

Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.

Frequently asked questions

How many 2020 Porsche 911 Turbo S S-As pass their MOT?

96.2% of the 661 2020 Porsche 911 Turbo S S-A MOT tests in this dataset passed — a 3.8% fail rate.

What is the most common MOT failure on a 2020 Porsche 911 Turbo S S-A?

Tyres, recorded in 1.7% of tests, followed by other defects (1.5%).

Methodology & source. Based on 661 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.